Install phan/phpstan local

vendor/netresearch/jsonmapper/contributing.rst

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+**************************************
+How to add your features to JsonMapper
+**************************************
+
+If you want to add a new feature or a fix to this library, please consider these aspects:
+
+- Respect the original code style and continue using it - it uses `PEAR Coding Standards`__.
+- Pull requests fixing a bug should include a test case that illustrates the wrong behaviour.
+- Pull requests adding a new feature should also include a test for the new feature.
+
+ __ http://pear.php.net/manual/en/standards.php
+
+Having test cases included in your pull request greatly helps reviewing it and will increase the chance of it being merged.